The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time.
b. provide a backup system if one or more of the telescopes go down.
c. to produce higher resolution images.
d. to avoid interference between signals from the separate telescopes.
e. to account for the motion of objects in the sky as a result of the Earth's rotation.
C
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If the temperature of 2.000 moles of an ideal gas is increased by 50
C then what is the increase in the total internal energy?
A. 1,247 J B. 1,980 J C. 2,250 J D. 2,750 J E. 3,030 J
Which of the following best describes the geological histories of the Moon and Mercury?
A) Early in their histories, they suffered many impacts and experienced some volcanism and tectonics, but they now have little geological activity at all. B) Impact cratering is the only major geological process that has affected their surfaces. C) All four geological processes were important in their early histories, but only tectonics still reshapes their surfaces today. D) Impact cratering shaped these worlds early in their histories. Then, during the past few million years, they were reshaped by episodes of volcanism and tectonics.
Saturn's larger satellites have lower average density than the Galilean satellites of Jupiter; therefore, we can conclude that Saturn's satellites contain less rock and more ice than the Galilean satellites.
Answer the following statement true (T) or false (F)
Studying a spectrum from a star can tell us a lot. All of the following statements are true except one. Which statement is not true?
A) The total amount of light in the spectrum tells us the star's radius. B) The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelengths. C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. D) Shifts in the wavelengths of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us.